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      <img src="../logo.svg" class="logo" alt=""><h1>NAICS - query NAICS codes and also see all children (subcategories) of any of those</h1>
      <small class="dont-index">Source: <a href="https://github.com/USEPA/EJAM/blob/HEAD/R/NAICS_FUNCTIONS.R" class="external-link"><code>R/NAICS_FUNCTIONS.R</code></a></small>
      <div class="d-none name"><code>naics2children.Rd</code></div>
    </div>

    <div class="ref-description section level2">
    <p>Used by naics_find()</p>
    </div>

    <div class="section level2">
    <h2 id="ref-usage">Usage<a class="anchor" aria-label="anchor" href="#ref-usage"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">naics2children</span><span class="op">(</span><span class="va">codes</span>, allcodes <span class="op">=</span> <span class="fu">EJAM</span><span class="fu">::</span><span class="va"><a href="NAICS.html">NAICS</a></span>, quiet <span class="op">=</span> <span class="cn">FALSE</span><span class="op">)</span></span></code></pre></div>
    </div>

    <div class="section level2">
    <h2 id="arguments">Arguments<a class="anchor" aria-label="anchor" href="#arguments"></a></h2>


<dl><dt id="arg-codes">codes<a class="anchor" aria-label="anchor" href="#arg-codes"></a></dt>
<dd><p>vector of numerical or character</p></dd>


<dt id="arg-allcodes">allcodes<a class="anchor" aria-label="anchor" href="#arg-allcodes"></a></dt>
<dd><p>Optional (already loaded with package) - dataset with all the codes</p></dd>


<dt id="arg-quiet">quiet<a class="anchor" aria-label="anchor" href="#arg-quiet"></a></dt>
<dd><p>whether to avoid printing results to console</p></dd>

</dl></div>
    <div class="section level2">
    <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    <p>vector of codes and their names</p>
    </div>
    <div class="section level2">
    <h2 id="details">Details<a class="anchor" aria-label="anchor" href="#details"></a></h2>

<ul><li><p>Starts with shortest (highest level) codes. Since tied for nchar, these branches have zero overlap, so do each.</p></li>
<li><p>For each of those, get its <code>children = all</code> rows where <code>parentcode == substr(allcodes, 1, nchar(parentcode))</code></p></li>
<li><p>Put together list of all codes we want to include so far.</p></li>
<li><p>For the next longest set of codes in original list of codes, do same thing.</p></li>
<li><p>continue until done for 5-digit ones to get 6-digit children.</p></li>
<li><p>Take the <code>unique(allthat)</code></p></li>
</ul><p><code>table(nchar(as.character(NAICS)))</code></p>
<p><code>   2    3    4    5    6</code></p>
<p><code>  17   99  311  709 1057</code></p>
    </div>
    <div class="section level2">
    <h2 id="see-also">See also<a class="anchor" aria-label="anchor" href="#see-also"></a></h2>
    <div class="dont-index"><p><code>naics_find()</code> <a href="NAICS.html">NAICS</a></p></div>
    </div>

    <div class="section level2">
    <h2 id="ref-examples">Examples<a class="anchor" aria-label="anchor" href="#ref-examples"></a></h2>
    <div class="sourceCode"><pre class="sourceCode r"><code><span>  <span class="fu">naics2children</span><span class="op">(</span><span class="fl">211</span><span class="op">)</span></span>
<span>  <span class="fu">naics_find</span><span class="op">(</span><span class="fl">211</span>, exactnumber<span class="op">=</span><span class="cn">TRUE</span><span class="op">)</span></span>
<span>  <span class="fu">naics_find</span><span class="op">(</span><span class="fl">211</span>, exactnumber<span class="op">=</span><span class="cn">TRUE</span>, add_children <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span></span>
<span>  <span class="va">NAICS</span><span class="op">[</span><span class="fl">211</span><span class="op">]</span><span class="op">[</span><span class="fl">1</span><span class="op">:</span><span class="fl">3</span><span class="op">]</span> <span class="co"># wrong</span></span>
<span>  <span class="va">NAICS</span><span class="op">[</span><span class="va">NAICS</span> <span class="op">==</span> <span class="fl">211</span><span class="op">]</span></span>
<span>  <span class="va">NAICS</span><span class="op">[</span><span class="st">"211 - Oil and Gas Extraction"</span><span class="op">]</span></span>
<span></span></code></pre></div>
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